Republican Marsha Blackburn holds an 8-point lead in her U.S. Senate campaign against Democrat Phil Bredesen, a new Emerson College poll released Thursday shows.

Meanwhile, a new CNN poll also released Thursday shows Blackburn with a 4-point lead over Bredesen, within that poll's margin of error. That's a change from a September CNN poll that showed Bredesen with a 5-point advantage.

The two new surveys are among a flurry released this week as Election Day nears on Tuesday.

Blackburn, a Williamson County congressman, and Bredesen, a former two-term governor, are locked in a bitter and expensive campaign to replace retiring U.S. Sen. Bob Corker.

The Emerson College poll found Blackburn had the support of 52 percent of respondents, compared to 44 percent for Bredesen. The poll found 3 percent of respondents undecided.

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President Donald Trump, who is set to campaign again for Blackburn on Sunday in Chattanooga, remains popular in the state, according to the Emerson poll. The survey found 54 percent of respondents had a generally favorable view of the president, compared to nearly 43 percent who do not.

The survey had a margin of error of plus or minus 4 percentage points.

The new CNN poll showed Blackburn had the support of 49 percent of respondents, compared to 45 percent for Bredesen.

The poll, conducted by SSRS from Oct. 24 to Oct. 29, surveyed 764 likely voters and has a margin of error of plus or minus 4.3 percentage points.

The September CNN poll showed Bredesen with 50 percent, compared to Blackburn's 45 percent. The September survey also had a margin of error of plus or minus 4.3 points.

Trump also has increased his popularity in Tennessee from September to October, according to the CNN poll. Trump was viewed favorably by 53 percent of respondents, up from 49 percent. The poll found 42 percent disapprove of the president, down from 48 percent in September.